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Impairment Charges - Schedule of Changes In The Carrying Amounts Of Goodwill (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2024	Jun. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024	Jun. 30, 2025
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Goodwill value			$ 748.5		$ 794.4
Terminal Values Long-term Growth Rate for Debt-Free Cash Flow			3.00%		3.00%
Goodwill impairment	$ 0.0	$ 675.3	$ 0.0	$ 675.3
Bedding
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Goodwill value			322.7		$ 310.0
Percentage of fair value in excess of carrying amount (as a percent)						20.00%
Goodwill impairment		587.2
Aerospace products
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Goodwill value					66.8
Percentage of fair value in excess of carrying amount (as a percent)						48.00%
Home furniture
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Goodwill value			68.3		67.7
Percentage of fair value in excess of carrying amount (as a percent)						34.00%
Work furniture
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Goodwill value			$ 54.4		$ 53.6
Percentage of fair value in excess of carrying amount (as a percent)						29.00%
Goodwill impairment		$ 44.5
Hydraulic cylinders
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Goodwill impairment	$ 43.6
Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Compound Annual Growth Rate (CAGR) Range for Sales			(2.00%)		(1.00%)
Discount rate ranges (as a percent)			15.00%		14.00%
Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Compound Annual Growth Rate (CAGR) Range for Sales			8.00%		12.00%
Discount rate ranges (as a percent)			20.00%		17.00%
Less than 50%
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value over Carrying Value divided by Carrying Value			50.00%		50.00%
Goodwill value			$ 445.4		$ 430.4
Terminal Values Long-term Growth Rate for Debt-Free Cash Flow			3.00%		3.00%
Less than 50% | Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Compound Annual Growth Rate (CAGR) Range for Sales			1.00%		(1.00%)
Discount rate ranges (as a percent)			15.00%		14.00%
Less than 50% | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Compound Annual Growth Rate (CAGR) Range for Sales			4.00%		12.00%
Discount rate ranges (as a percent)			17.00%		17.00%
50% - 100%
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Goodwill value			$ 303.1
Terminal Values Long-term Growth Rate for Debt-Free Cash Flow			3.00%
50% - 100% | Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value over Carrying Value divided by Carrying Value			50.00%
Compound Annual Growth Rate (CAGR) Range for Sales			(2.00%)
Discount rate ranges (as a percent)			15.00%
50% - 100% | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value over Carrying Value divided by Carrying Value			100.00%
Compound Annual Growth Rate (CAGR) Range for Sales			4.00%
Discount rate ranges (as a percent)			17.00%
101% - 300%
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Goodwill value					$ 364.0
Terminal Values Long-term Growth Rate for Debt-Free Cash Flow					3.00%
Discount rate ranges (as a percent)					14.00%
101% - 300% | Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value over Carrying Value divided by Carrying Value					101.00%
Compound Annual Growth Rate (CAGR) Range for Sales					3.00%
101% - 300% | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value over Carrying Value divided by Carrying Value					300.00%
Compound Annual Growth Rate (CAGR) Range for Sales					7.00%

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